I guess the direction (right turn clyde) of this thread in combination with the 20k that was suggested on the web site leads me to jump in. I tested a Semperon pc recently to see how many pulses I could get to. It was able to get to a bit more than 70k.
I ran a motor with it. The drive was a Centent 10 microstep running with about 80 volts in. Motor was a NEMA 34 from Keling with nothing hooked to it. The system was able to produce a bit more than 70k PPS. I've got to say that the motor exhibited significant loss of torque at that speed -- about 2100 RPM. I wouldn't want to run a machine tool using steppers with speeds like that. But to make matters worse I switched to a Gecko 210 and 5 microsteps and was able, with real long accel and decel periods to get the motor to more than 4200 RPM. At those speeds it took nearly a minute to stop the motor without loosing steps. The PC was running a full EMC2 with the mini interface and most of the non emc stuff like firefox and gimp showed significant slowdowns. I ran these to prove I could while running the motor. I did not get any reported real time errors and heard no changes in motor noise during the testing. It was fun but I can't imagine the value of that high a step rate unless one were running step and direction into a servo system. Rayh On Tue, 2007-10-02 at 23:17 -0400, Dean Hedin wrote: > I am surprized that Mach under Windows could out perform EMC in steps/sec > since EMC is built on a realtime kernel. > > I presume it is therefore that it is the "quality of steps" that EMC is > better at? In otherowrds EMC produces more accurate and precise steps. > > > ----- Original Message ----- > From: "Sam Sokolik" <[EMAIL PROTECTED]> > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > Sent: Tuesday, October 02, 2007 3:20 PM > Subject: Re: [Emc-users] Desktop CNC Website Information > > > > the only other thing I can think of is that the max step/sec is a bit on > > the > > low side. But I don't know a good safe step rate to put on paper. > > (~20k/s > > w/Parport) - expecially because 2.2 will have doublefreq which will > > increase > > the step rate a bit more. > > > > sam > > ----- Original Message ----- > > From: "Kirk Wallace" <[EMAIL PROTECTED]> > > To: <[EMAIL PROTECTED]>; "Enhanced Machine Controller (EMC)" > > <emc-users@lists.sourceforge.net> > > Sent: Tuesday, October 02, 2007 1:51 PM > > Subject: Re: [Emc-users] Desktop CNC Website Information > > > > > >> Updated here: > >> > >> http://www.wallacecompany.com/cnc_lathe/control_table-kw1a.htm > >> > >> Kirk Wallace > >> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > >> On Tue, 2007-10-02 at 13:36 -0400, Stephen Wille Padnos wrote: > >>> Cool. > >>> > >>> A few changes though: > >>> > >>> Name: EMC2 > >>> Additional Hardware: optional > >>> Max Axes: 9 (XYZ linear, ABC angular, UVW linear) > >> ... snip > >> > >> > >> ------------------------------------------------------------------------- > >> This SF.net email is sponsored by: Microsoft > >> Defy all challenges. Microsoft(R) Visual Studio 2005. > >> http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ > >> _______________________________________________ > >> Emc-users mailing list > >> Emc-users@lists.sourceforge.net > >> https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > ------------------------------------------------------------------------- > > This SF.net email is sponsored by: Microsoft > > Defy all challenges. Microsoft(R) Visual Studio 2005. > > http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > ------------------------------------------------------------------------- > This SF.net email is sponsored by: Microsoft > Defy all challenges. Microsoft(R) Visual Studio 2005. > http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
